Electric tool and stand



Oct. 22, 1957 E; BQDMER ELECTRIC TOOL AND STAND 2 Sheets-Sheet 1- FiledApril 19, 1954 m m m Mn INVENTOR EUGENE- BODMER FF- W QQQ q u N rm BYATTORNEY E. BODMER ELECTRIC TOOL AND STAND Oct. 22, 1957 2 Sheets-Sheet2 Filed April 19, 1954 INVENTOR Euesm: BODME'R B qfw 15.770442 ATTORNEYUnited States Patent ELECTRIC TOOL AND STAND Eugene Bodmer, Maywood,11]. Application April 19, 1954, Serial No. 424,122

3 Claims. (CI. 77-19) This invention relates to electric driven toolssuch as electric hand drills, grinders, buffers, or the like, and isparticularly directed to a novel stand for supporting the drill inoperative position whereby it may be manipulated in a manner similar tostandard or larger drills.

Stands have heretofore been proposed and used for such purposes but theyhave been subject to various objections, one of the principal objectionsbeing that compression springs have been utilized for raising the drillor returning it to inoperative position, the arrangement being such thatthe spring provides a variable tension which must be overcome by theoperator in using the drill, and also makes the operation of the drillmore unsatisfactory or critical as it requires pressure to overcome thespring as well as feed the drill.

The objects of this invention are to provide a novel stand forsupporting electric drills, or the like, in which the drill iscounter-balanced by means of an adjustable weight; to provide means forholding the drill in substantially full floating suspension whereby itmay be readily manipulated for the drilling operation; to provide astand for an electric hand drill with manual operated means for pressingthe drill into the work piece; and to provide such other novel featuresand improved operating characteristics as will be described more fullyhereinafter.

In the accompanying drawings illustrating this invention,

Fig. l is a side view showing my improved stand with a hand drillcarried thereby and operative means including a weight forcounter-balancing the drill.

Fig. 2 is a plan view of a cord or chain guide and other parts as shownin Fig. 1.

Fig. 3 is a detail of the anchor for anchoring the chain to the drillsupporting fork or arm.

Fig. 4 is an enlarged detail of the adjustable weight and chain, partsbeing broken away.

Fig. 5 is a longitudinal sectional view taken substantially on the line5-5 of Fig. 4.

Fig. 6 is a longitudinal sectional view taken substantially on the line6--6 of Fig. 2; and

Fig. 7 is a detail of the chain support and guide.

As shown in these drawings, the stand 10 has a base 11 with a smootharea 12 for supporting the workpiece and is provided with a tubularcolumn 13 upon which the drill supporting mechanism is mounted. A collar14 is slidably mounted on the column and may be held in adjustedpositions by means of a set screw 15 having an elongated operatinghandle 16. A second block or elongated collar 17 is slidably mounted onthe column below the collar 14. A U-shaped arm 18 embraces the block 17and is held in adjusted positions by means of set screws 19 which passthrough slots 20 in the sides of the arm. The hand operated drill 21 issecured to the arm 18 in any desired manner and is shown as being heldin the cradle 22 which is adjustably secured to the end of the arm 18 bymeans of a U-bolt 23 and nuts 24.

The operating lever 25 for raising and lowering the drill and feeding itinto the workpiece is pivoted at 26 to the block 17 and extends to therear of the stand where it is connected at 27 to a short link 28 bymeans of a pivot 29. The upper end of the link 28 is pivotally connectedto a projection 30 on the collar 14 by means of a pivot or screw 31.This lever and linkage arrangement is so proportioned as to properlyoperate the drill for its difierent movements.

A rectangular rod 32 is secured to the lug or projection 30 by means ofa threaded portion 33 and nut 34 as shown in Fig. 1. This rod extendsdownwardly through rectangular shaped bearings 35 in the block 17 andserves to prevent the drill head from twisting around the center line ofthe column 13 and serves as a guide rod for the block.

The counter-balancing or weighted arrangement for the drill which formsone of the principal and most important features of the presentinvention and which distinguishes it from the prior stands is shown inFig. l and other details. A tubular stem or pipe 36 fits in the top ofthe column 13 and extends a sufficient distance to give a good bearingfor the weight support. The stem 36 carries a pair of spaced apart arms37 which may be secured to the stern in any desired manner and alsosecured to a washer 36' as by welding or the like. Wheels or pulleys 38and 39 are rotatably mounted between the ends of the plates on bolts oraxes 40, 41. A link chain 42 as shown in Fig. 4 is connected to the arm18 by means of a bent pin or wire yoke 43 as shown in Fig. 3, the endsof the pin extending through the slots 20 in the sides of the arm andthe center of the pin passing through a hole in the chain as shown.

The chain passes up and over the pulleys 38 and 39 and down to theweights 45, as shown in Fig. l. The main weight 45 has a verticalopening 46 for the chain to' pass through and a transverse opening 47through which a pin or wire 48 extends and is connected with the end ofthe chain. The ends of the wire are preferably bent down to preventdisengagement with the weight. The main weight 45 has an annularprojection 49 as shown in Fig. 5 which engages with a recess 50 in anauxiliary weight 51 which in turn is provided with an annular projection52 for another of a series of weights which may be added or taken awayfrom the main weight in order to properly balance the parts.

It will be noted that the arms or cross plates 37 are of sufiicientlength so that the chain will have sufiicient clearance from the otherparts of the device. It will, of course, be obvious that a main weightmay be used of any suitable size to counter-balance the drill and partsassociated therewith or the auxiliary weights may be added as de- 1sired.

The advantages of the counter-weight arrangement is that it providesgreater flexibility in the movement of the drill, easier operation,increased travel length of drill bit at a given setting of the drillhead on the column, greater sensitiveness during the drilling operationand more convenience when changing to different lengths of drill bits.

With my improved counter-weight, the weight of the drill head and theweights are always supported by the main column and therefore the partsare in full floating conditions at all times. This permits easy andconvenient adjustment or setting of the apparatus for drilling or duringadjustment of the drill head height.

Another substantial advantage with the counter-weight balancing is thefact that the ratio of drill travel distance is greater than with thearrangement heretofore used, such as spring balancing. The range oftravel is limited only by the operating lever and link action. With mycounterweight balancing, the various parts are freely floating and theavailable drill travel is abundantly long to make up for lack ofnearness to the workpiece.

Other advantages will readily suggest themselves with those familiarwith this art and the advantages over the spring operated stand isapparent from the above description.

Having thus described my invention, what I claim is:

1. In combination, a base, a tubular column extending upwardly from thebase, a collar slidably mounted on the column, means for holding thecollar in adjusted positions, a block slidably mounted on the columnbelow the collar, a bracket adjustably mounted on a block, means forholding the bracket in adjusted positions, an electric hand tool carriedby the bracket, an operating lever pivoted on the block, a linkconnecting one end of the lever with the collar the other end of thelever extending forwardly adjacent to the drill, a rod secured to thecollar and extending downwardly through a bearing in the block andserving to prevent the drill from twisting around a center line of thecolumn, a substantially T-shaped bracket having a stem extending intothe top of the column and rotatable therein, pulleys on said bracket, aweight, flexible means connecting the weight and extending over thepulleys and connected with the bracket that supports the tool whereby itwill serve to counter-balance the tool and connected parts.

2. In a drill stand of the character set forth, the combination of abase for supporting a work piece, a tubular column extending upwardlyfrom the base, a collar slidably mounted on the column adjacent to thetop thereof, a set screw for holding the collar in adjusted positions,

a block slidably mounted on the column below the col- 30 lar, an armsecured to the block, means for attaching an electric hand drill to saidarm, an operating lever pivoted to the block, a link connecting one endof the lever with the collar, said lever extending forwardly and adaptedto raise and lower the block, a rod secured to the collar and extendingdownwardly through a bearing in the block and serving to guide the blockin its vertical movement, pulleys mounted at the top of the column, acounterweight, a flexible member connecting the arm with saidcounterweight and rove over said pulleys, substantially as shown.

3. In an apparatus of the character set forth, the combination of abase, a tubular column extending upwardly from the base, a collarslidably mounted on the column adjacent to the top thereof, means forholding the collar in adjusted position, a block slidably and rotatablymounted on the column below said collar, an arm secured to the block,means for attaching an electric hand drill to said arm, a lever pivotedto the block, a link connecting one end of the lever with said collar,said lever extending forwardly and adapted to be actuated to raise andlower the block, a rod secured to the collar and extending downwardlythrough a bearing in the block and serving to guide the block in itsvertical movements, pulleys mounted at the top of the column, acounterweight spaced outwardly from the block, a flexible memberconnecting the arm with said counter-weight and rove over said pulleys,the arrangement being such that the electric hand drill may be adjustedvertically and will also have free rotatable movement around the column.

References Cited in the file of this patent UNITED STATES PATENTS1,117,917 Schoenky Nov. 17, 1914 FOREIGN PATENTS 136,054 Germany Oct.31, 1902

